Idea about how to improve droprate of dungeon

The idea is for some special dungeon (morganthe, hades ...), you have 100% to gain 1 (may be extra one with 20%) exchange ticket.In front of that dungeon, we have exchange ticket NPC.NPC will allow us to exchange all possible stuff that drop in that dungeon for a number of exchange ticket.

This will help people to exchange what they want if they farm that dungeon for so many times